William borrer



(No Hoden .n e .D S s m e h S 2 TW B, E R R O B W.

TOOL.

Patented Jan. 4, 1898l invul-rok TUM GM. gem.

ma nonms vEfEns co, mooumo.. vusmnurou. o. c:A

(No Model.; I 2 Sheetsff'sheet 2. W. BGRRBR, J1. T001..

No. 596,568. Patented Jan. 4, 1898.

IEmama WITNESSES. HIEPfTDR UNITED STATES yPATENT OFFICE.

WILLIAM BORRER, JR., OF I-IURS'IPIERPOINT, ENGLAND.

TOOL.

SPECIFICATION forming part of Letters Patent No. 596,568, dated January4, 1898. Application iiled June l, 1897. Serial No. 639,061. (No model.)Patented in England November 17, 1896, No. 25,874.

To (LZZ whom t may concern:

Be it known that I, VILLIAM BORRER, J r., a subject of the Queen ofGreat Britain, residin g at Hurstpierpoint, in the county of SusseX,England, have invented a new and useful Tool, (for which I have obtainedLetters Patent in Great Britain, No. 25,874, bearing date the 17th dayofNovember, 1896,) of which this is a full and complete specification.

This invention relates to a new tool adapted to cut or sink circular orpartially circular holes through or in any material capable of being cutwith a saw and also for cutting out either wholly or partially roundpieces.

In the accompanying drawings, which illustrate this new tool, Figure l,Sheet No. l, is a view in plan. Fig. 2, Sheet No. l, is a view inelevation, partly in section, on line o: se in Fig. 1. Fig. 3, Sheet No.2, is aview in end elevation showing the cutter; and Fig. 4, Sheet No.2, is a View in end elevation showing how the tool is fixed to the Work.

Throughout the views similar parts are marked with like letters andfigures of reference.

A is a bracket having a base 2, a pairof vertical plates 3, and a topplate 4. The top plate 4 has a hole in which the shank 5 of a screw O isjournaled, and the said shank is provided with a collar 6 below theplate 4. The bracket A is pivoted to the work or material to be cut byavertical pin or screw X,

- which passes through a hole in the base 2.

B is a block which is slidable vertically between the plates 3 of thebracket A, and 7 are plates secured to the block B and overlapping theedges of the plates 3, so that the block B is retained between theplates 3. The block B is actuated by a screw C, mounted in the top ofthe frame A and threaded into the said block. The screw C carries amilled flange D or its equivalent, by which it can be rotated to varythe Vertical position of the block B in the frame A, and is extendedupward beyond the said flange to carry a loose cap E, by which the toolcan be steadied by the hand when in use. In the block B is mounted -abar F, which carries the cutter G. This bar, which is preferably of asquare section, is adjustably fixed to the block BI by means ofset-screws a. a, threaded in alternate lugs carried by the guide-plateson the block B,

through which the said block passes and adapted to impinge on the top ofthe said bar, so that the radius about which the cutter moves can beregulated according to the curve or circle it is desired to cut. On theone end of the bar F is mounted a bracket H, adapted to carry the cutterG and also a handle J for operating the tool. The cutter G, whichconsists of a thin sheet of steel having saw-like teeth on its cuttingedge, is clamped to the bracket A by means of a plate H', adapted tocarry the handle J. To the plate H is iixed a strip K, of spring-steel,which is adapted to be IieXed to any required curve (which must agreewith the radius of the bar F),by means of two screw-bolts 7cand nuts7c', carried by arms h on the bracket H.

In addition to formingsaw-teeth on the bottom edge of the cutter,`teeth,preferably of a finer pitch, maybe formed on its sides to assist thecutter in cutting up to a dead-stop and to clear the cut of sawdust.Obviously, also, the cutter may have teeth on its upper side, so that itcan be reversed.

The bracket A is pivote'd to the material to be cut by means of anordinary wood-screw X, adapted to pass through a hole in the base of thebracket A. A convenient method of screwing the screw X home is asfollows: The screw X is inserted in the hole from the base of thebracket A. A block, such as Y, having a knife-edge, such as y, adaptedto engage with the slot in the top of the screw, is then inserted in thebracket A, so that it so engages with the screw X, and the sliding blockB is then screwed down on to it. This locks the screw to the bracket andenables it to be screwed into (and also out of) the material byrotatingthe tool. After the screw X is screwed home the block B is raised toallow the block Y to be removed, when the tool is ready for use.

To enable the cutter G to clear itself, its teeth may set as in anordinary saw, or the plate out of which it is made may be of a slightlygreater thickness at its center than at its ends.

In use the tool is oscillated about its pivot through the required arc,the cutter being gradually lowered by means of the screw as' the workproceeds. If a complete circle is to be cut, the tool is oscillatedthrough a con- Venient arc and at the same time moved gradually roundthe pivot.

I wish it to be particularly understood that I do not limit myself totheprecise details of construction hereinbefore described, and illustratedby the accompanying drawings, but that l hold myself at liberty to makesuch changes and alterations as fairly fall Within the spirit and scopeof my invention.

What l claim as my invention, and desire to secure by Letters Patent,is-

j 1. An improved tool for cutting or sinking circular or partiallycircular holes th rough or in any material capable of being cut with asaw, consisting of a frame, means for pivoting it vertically to thematerial to be cut, of a block adjustable vertically in the said frame,of a bar mounted radially in the sliding block and of a cutter mountedon the said bar, as set forth.

2. An improved tool for cutting or sinking circular or partiallycircular holes through or in any material capable of being cut with asaw, consisting of a frame, means for pivoting it vertically to thematerial to be cut, of a block slidingvertically in the said frame andadapted to be adjusted therein bya screw, of a bar adjustable radiallyin the sliding block7 of a cutter mounted on the said bar and of anoperating-handle mounted on the radial v bar, as set forth.

3. An improved tool for cutting or sinking circular or partiallycircular holes through or in any material capable of being cut with asaw, consisting of a frame, means for pivoting it vertically to thematerial to be cut, of a block sliding vertically in the said frame, ofa screw mounted in the frame and adapted to engage with the slidingblock, of a bar adjustable radially in the sliding block, of a saw-likecutter mounted on the said bar and capable of being flexed thereon tothe required curve, of an operating-handle mounted on the radial bar, asset forth.

4. lAn improved tool for cutting or sinking circular or partiallycircular holes through or in any material capable of being cut with asaw, consisting of a frame, means for pivoting it vertically to thematerial to be cut, of a block sliding .vertically in the said frame, ofa screw provided with a milled head or flange mounted in the frame andadapted to operate the sliding block, of a bar adjustable radially inthe sliding block, of a saw-like cutter mounted on the said bar, ofmeans for adjusting the curve of the cutter, of an operating-handlemounted on the end of the radial bar beyond the cutter, and of a steadying cap or handle mounted on the top of the adjusting-screw, as setforth.`

` WILLIAM BQRRER, J UNR.

Vitnesses WILLIAM H. JAMES, ALFRED K. OROAD.

